Former Soviet leader Mikhail Gorbachev, left, German Chancellor Angela Merkel, centre, and former Polish President Lech Walesa, left, sign a photograph in Berlin, Germany, Monday, Nov. 9, 2009, during the commemorations of the 20th anniversary of the fall of the Berlin Wall in 1989. l. AP Photo logo AP Photo 27 months ago

Former Soviet leader Mikhail Gorbachev, left, German Chancellor Angela Merkel, centre, and former Polish President Lech Walesa, left, sign a photograph in Berlin, Germany, Monday, Nov. 9, 2009, during the commemorations of the 20th anniversary of the fall of the Berlin Wall in 1989. l.